Side sampler for deep wells



July 11, 1944. `w` J. BARNHART SIDE SAMPLER FOR DEEP WELLS FledfJune 16,1941 F14 /mV/n Patented July 11, 1944 UNITED STATES PATENT OFFICE Y2,353,435 f sinn SAMPLER Fon DEEP WELLS l waiter. J. Barnum, HuntingtonBeach, Calif. .Application June 1'6, 1941, Serial No. 398,283 1s claims.(ci. 25e- 1.4)

This invention relates to apparatus for enabling samples to be takenfrom the wall of deep wells, such as oil wells. Apparatus for thispurpose has recently been suggested to perform the function of the usualcore-taking barrelV which 'is attached to the lower endA of a toolstring, and winch takes a. core from the end of the bore;

One of the objects of the invention is to provide a sample-takingapparatusof simple` construction, which can be operated in the hole ona-sand line or, if desiredpon a tubular tool string.

t A further object of the invention is to provide a construction for`the apparatus, which facilitates the use of agangof sample-taking tools,all of which can be projected simultaneously in a lateral direction fromthe axis of the well, and into the earth and formation at the side wallof the well-bore.

In its preferred construction the apparatus includes a suspendedsample-taking barrel or barrels, the lower ends of which are located insuch a way that when lrelative movement in a longitudinal directionbetween parts of the tool takes place, the sample-takers will beprojected outwardly; and one of the objects of the invention is toprovide a construction in which the sampletaking tool or barrel isunconnected with the cam means that cooperateswith the sample-taker toproject it out into the side of the well-bore; also to provide a singlepoint of connection of the sample-taker to its carrier, to facilitateAthe removal of` the sample-takers after they have pulled to the mouthof the well.

A further object of the invention is to provide a construction whichfacilitates `the taking of a plurality of samplesat different levels,and

the construction involves the use of a plurality of differentsample-takers, each cooperating `with a` camface on a multiple camagainst which the sample-takers are forced when they are being projectedinto` their active position.y The sampletakers are projected `outwardlythrough the medium of a relative downward movement of their carrier withrespect to the multiple cam; and one of the objects of the invention isto provide means for preventing themultiple cam Afrom jamming on thetool-carrier, so that it would be pulled up with the carrier in spuddingwhen the upward movement of the tool has started, to bring the tooloutof the well.

In the preferred embodiment of the invention,l

the tool includesa housing ca-rrying a multiple cam, and provided withside openings adjacent to which the lower ends of the sample-takerslie.` The tool is operated with a tubular casing or drill string, whichVis also provided with openings through its wall, through which thesample-takers are to be projected; and one of the objects of thisinvention is to provide simple means for effecting an alignment of theopenings in the housing with the openings in the tubularrtool stringbefore the sample-takers are projected outwardly.` t Q In the operationofthe tool, the carrier ,for the sample-takers is dropped downwardly sothat the lower ends or under sides of the pendant sampletakers, strikeagainst cam faces that deflect them laterally into theside of the`well-bore. This operation may be carried on as a spuclding operation,and this wouldbe the usual procedure in taking' samples from earthyformation. In a case where `a sample-taker is to encounter con siderableresistance, for example, in shale or harder formation, I force thesample-takers down by means of an inner core-tool string, and in thatcase I providefa locking head for connecting up the tool-carrier to acore-tool string.V Itis one of the objects of this invention to providea device of `this kind, in which the tool-carrier can be controlled soas to lock itself automatically as it were, to the core-tool string;This locking head involves the; use of holding pawls cooperating withinclined rack teeth formed on the interior ofthe core-tool string; andone of the objects of the invention is to provide a mounting for thesepawls, ythat `will -prevent Vthem from being injured in operation, andat the same time, to provide means whereby they will automaticallyrelease themselves from the rack teeth when the sand line is pulled upto release the locking head.

Further objects of the invention will appear hereinafter.

The invention consists in thenovel parts and combinationf'of parts to bedescribed hereinafter, all of which contribute to produce an eflcientside sampler for deep wells.

A preferred embodiment of the invention is zdescribed in the followingspecification, while the broad scope of the invention is pointed out inlthe `appended claims. In the drawing:

Fig. 1 is `a vertical section through the lower end of a drill string,core barrel collar, with the sample-taking apparatus carried within thesame, and in this view the parts are represented in their normalposition, that is to say, the parts of the tool on the sand line areshown `in the relation they have when they arrivev at! the well bottom,and before 4the sample-taking operation is started. In this view theupper portion of the vhead 5.

tool carrier, including .a Jar, is shown in elevation.

Fig. 2 is a view similar to Fig. 1, but showing the sample-taker toolsin their active position and projected out into the earth at the sideo1' the well-bore.

Fig. 3 is a vertical section through the apparatus taken about on theline 3-3 of Fig. 1, and particularly illustrating the construction ofthe tool-carrier and the means for mounting the core-takers orsample-takers in the same. But at its lower end this view illustrates amodification in the mounting of parts.

Fig. 4 is a horizontal section upon a l-arger scale taken about on theline 4-4 of Fig'. 1, and

.particularly illustrating an abutment which is provided on the outerside of the housing at the point diametrically opposite to that at whichthe tools lare projected. outwardly,

Fig. 5 is a fragmentary view and is an enl larged section taken throughthe apparatus at one of the sample-takers, andpassing through theVsample-taker.v This view particularly illustrates the preferred form ofone of the samplesample-taker.

Fig. v6 is a vertical section taken through the takers, and illustratesalso how mud at the back of the sample, finds exit from the bore of theshows the holding pawls in their released posi- Y tion.

Referring more particularly to the parts, and especially to Figs. 1 to3, I indicates a -tool string in the well-bore, the lower end of thetool string being provided with a bottom head or shoe 2, and this toolstring is provided at suitable points with openings 3 through its wall,through .which the sample-takers are to be projected. The inner portionof the apparatus includes a tubular housing 4, the upper end of whichcarries -a guide head 5 threaded into the same. At suitable points,depending on the number of samples that I the tool is to take, and alsoon the difference in level for the different sample-takers, the wall ofthe' housing 4 is provided with openings 9 which are capable ofregistering with the openings 3 -in the tool string whenthesample-takers 1 are to be projected outwardly. 'I'hese sample-takers 1are hollow "core barrels which are all supported on their correspondingsupporting pinsA 3 on a tool carrier 9. 'Ihis tool carrier is anelongated mandrel preferably provided with a longitudinal vertical slotI in which the samplecarriers 1 hang. The sample-carriers are preferablycurved into arcuate form as indicated in Fig. 1, and. beloweachsample-carrier a cam II is provided, each cam consisting of a. blockor web extending acros the bore of Ythe housing and rigid within thesame. Each cam II presents a cam edge I2 on its upper side, to exert acam action on the sample-takers when they.move

downward relative to the cams II.

However, in loweringthe toolv down the well. this relative movementcannot occur on account of a frangible pin I3 which connects the guidehead V of the housingl to the reduced shank I4 of the tool-carrier 9.But when the tool arrives at the bottom of the well, this pin I3 isnally sheared, and the shank slides through the guide The seating of thetool at the bottom of the drill string I effects the alignment of theopenings 3 yand Ii, and after this alignment takes place, the pin I3shears and the sample-takers 1 are cammed outwardly on the cam faces I2.

The means for effecting the alignment of the openings 3 and 6 preferablyincludes a pin I5 projecting inwardly at the lower end of the drillstring 3, the lower end of the housing 4 being provided with a cam edgeI6 to cooperate with this pin to rotate the housing or orient it on itslongitudinal axis to bring the openings 6 into alignment with theopenings 3, When this occurs the pin I5 will lie in a sort vertical slotI1 into which the cam edge I6 will have guided the pin. After thisalignment of the openings occurs, then the continued downward movementof the toolcarrier 9 will break the pin I3 and project the sample-takersout through the aligning openings. In considering the operation of thisapparatus, it Will be evident that it is necessary to provide means forpreventing any .possibility of the parts jamming themselves in therelation in which they are shown in Fig. 2. In other Words, it isnecessary to provide means for insuring that when `the sand line ispulled upwardly to pull up the tool-carrier 9, the cams II-and thehousing 4 which carries them, will remain relatively xed to permit theshoulder I8 at the upper end of the tool-carrier to move up to the underface of the guide head 5. For this reason I provide a check device oranchor device to hold back the housing when the upward movement begins.For this purpose I prefer to provide a central opening I9y in the shoe 2to cooperate with a yielding, or spring, mandrel 20. This mandrel isthreaded at its upper end into the bore 2|, of a thick-walledA `carrier9 starts back, the housing 4 will be held down temporarily. Of course,as soon as the shoulder I8 of the tool-carrier comes against the guidehead 5, then the housing will be brought back to the relationillustrated in Fig. 1. The continuedupward movement of the tool-carrierwill, of course, take the housing with it and the spring tongues 22 willrelease themselves from thel socket I9.

-The upper end of the tool-carrier above the shank I4 is jointed to ajar device 25, carried on a sand line 26. In operating the apparatusillustrated in Fig. 1, the jar is used to break the shear pin I3, andafter the pin is broken, the sample-takers 1 are spudded by means of thejar device 25. During this spudding operation, oi' course, the dragdevice including the resilient mandrel v2li and its cooperating socket I9, hold the housing 4 in a fixed position while the toolcarrierv 9 ismoving up and down.

In Fig. 6 I illustrate another type of sampletaker in which thesample-taker is not curved. In this case the sample-taker includes anupper body portion 21 and a lower end or core barrel portion 28 that maybe threaded into the lower end of the body 21, the body being cored outto form a duct 29 at its upper end through which mud can pass upwardlywhen the sample is being taken, and such mud would nd an outlet througha relief opening 30 near the hub, and adjacent to the supporting pin 3I.The under side 'of the body 21 may be slightly curved if desired, tocooperate with the cam face 32. And the camlace 32 is preferably curvedin transverse crossJsection about as indicated. This iorm ofsample-taker has the advantage over the reaction device which interlocksthe upper end of the tool-carrier 33, with the tool string 34corresponding to the tool string I illustrated in Figs. 1 and 2. Thisreaction head indicated generally by the numeral 35, is intended to beinterchangeably attached to the upper end of the carrier throughthemedium of a tool joint connection 33. This reaction device 35 isformed into a head preferably carrying two oppositely disposed pawls36a, and the tips of these pawls ride adjacent to circumferentiallyvformed rack teeth 31 on the inner face of the tool string 34. Thesepawls extend upwardly from their pivot pins Il that attach them to thereaction head, fand are normally pressed to the rack teeth 31 by a coilspring 33 set in sockets between the pawls. In other words, the reactionhead 35 carries these pawls ready to move outwardly and normally ridingolf of the teeth. The upper end of the head 35, however, is supported ona shoulder 4I on a tubular hanger 42 that is suspended on the sand line,with clearance permitting relative downward movement of the hanger. Inthe position shown in Fig. 6, the wall of the hanger holds the pawlsback, but when the sand line is slackened, the hanger will move down sothat slots 44 will permit the spring 39 to move the pawls out againstthe rack teeth,- as indicated in dotted lines in Fig. 6. This will lockthe head tothe tool string so that by lowering the coretool string 34,the tool-carrier 33 will be forced down and will project thesample-takers outwardly. When the driving head 42 is pulled up, thelower ends of the slots will "cam the pawls in, out of contact with therack teeth. A feather connection 4I a keeps the slots in alignment withthe pawls 33.

Instead o1' employing a shear pin such as I3 -i'or holding up the corebarrel carrier to prevent premature operation o! the core takers inrunning into the hole, I may employ a coil spring 4l` in the plug 4b(see` Fig. 3), the bore of the plug being enlarged `to form a springbarrel. Thisspring thrusts up against the lower end of the core toolcarrier 3a.

InFig. 5, I illustrate in detail the construction oi' oneof thesample-takers 1 illustrated in Figs. 1 and 2. This tool is preferably ofhard tough steel 'formed at its mouth 48 into a cutting edge. Therearend of the chamber 41 in the tool is provided with a relief opening 48through which mud -49 back of the core or sample 50, can 11nd exit.

In lllg. 2 I illustrate the relation of the parts while the housing 4 isanchored to the shoe 2. 'Iheposition of the parts illustrated, mightcorrespond to an assumed position during a spudding operation.

During the spudding operation, it should be understood that the sandline is only pulled up far enough to bring the shoulder I8 nearly up tothe guide head 5, but not to strike and pull up the guide head in such away as to loosen the anchorage of the housing 4. In this way theanchorage for the housing will hold the cam webs II down in their properposition while the spudding operation proceeds.

OI course, after the spudding has progressed suiliciently to insure thatthe' core-takers have taken satisfactory samples, then the sand line canbe pulled up, which will of course, pull the anchormandrel 20 out of thesocketl I3 and this, of course, will throw the openings 6 out of linewith the openings 3 in the tool string I. 'I'his feature is ofassistance in enabling the coretakers to keep their cores intact untilthe mouth o1' the well is reached.

In practice, the outside diameter of the tool string I is, of course,considerably lessthanthebore of the hole 5I in the earth. Hence it isnecessary to provide means for preventing the reaction that occurs frompushing the tool carrier over to the opposite side of the hole, andthereby interfering with the emciency of operation of the core-takers,that is to say, reducing their penetration into `the side of the hole.In order to overcome this diillculty, I prefer to provide an outwardlyprojecting abutment l2 (see Fig. 4) which is in the form of an elongateddished sheet that is secured to the outer face of the tool string I bywelds 53 along its edges. The lower end of this abutment may be turnedi'n against the lower face of the shoe 2, and the upper end can beturned in and welded as indicated at 54. to the side of the tool stringinthe vicinity o! the Jar w device 25, or just below the same.

AS illustrated in Fig. 3, the core-takers or Y sample-takers 1 aresuiilclently wide to substantially fill the slot I0 in the tool-carrierin` which' they operate, allowing of course, sumcient clearance for easymovement. In this way the side walls of the slot II) brace the tools 'Iand'reduce the strain on their suspending pins 8. The suspending pins 3are, of course, loose in their bores or sockets, and are easily drivenout when the tool has been pulled up to the mouth of the well, to enablethe sample-takers to be removed and carried to a laboratory.

Many other embodiments of the invention may `gf-"jbwresorted to withoutdeparting from the spirit -oi the invention.

What I claim is:

1. In a sampling tool for taking a sample from the side oi a well-bore,the combination of a tubular tool string having an opening in its wall.a tubular housing' within the tool string having an opening through itsside wall, capable of aligning with the nrst named opening, atool-carrier, a sampler-tool movably supported in the carrier and havingits receiving mouth at its lower end,` and cam-means unattached to thesample-taker but lying in the path of the sample-taker for defleetingthe same outwardly through the openings when the tool-carrier is movedlongitudinally in the housing, to force the mouth of the sampletakerinto the earth and formation alongside the well-bore.

2. In a sampling tool `for taking a sample from the sidev of awell-bore, the combination of a tubular tool string having an opening inits wall, a tubular housing within the same having an opening throughits side wall, normally out of line, butcapable of aligning with. thefirst named i opening, a tool-carrier, a sampler-tool movably supportedin the carrier and having its receiving mouth at its lower en-d, andlying opposite the said opening in the housing, means for effectingv thealignment of the said openings, "and cammeans unattached to thesample-taker but lying in the path of the sample-taker for deflectingthe same outwardly through the openings when the tool-carrier is movedlongitudinallyin the hous ing to force the mouth of the sample-takerinto the earth and formation alongside the well-bore.

3. A sampling tool to be used in a deep well for taking a sample fromtheside of the well bore, comprising in combination, a tubular housinghaving an opening through its wall, a toolcarrier within the housingandcapable of moving longitudinally within the same, a sampler tool movablysupported on the carrier and having its receiving mouth at its lower endlying adjacent the Said opening, cam-means rigid with the housing lyingin the path of the sample-taker for defiecting the same outwardlythrough the said opening when'the tool-carrier is moved longitudinallyin the housing, and frangible means normally preventing relativelongitudinal movement of the tool carrier and the housing. I f

4. Sampling apparatus to be used in aV deep well for taking a samplefrom thel side of a well bore, comprising in combination, a housing, atool-carrier within the housing and capable of moving longitudinallywithin thesame, frangible means connecting the tool-carrier and thetubular housing, a sample-taker movably supported on the carrier andhaving its receiving mouth at its lower end, a tool string forsupporting the toolicarrier withl means associated therewith forenabling the carrier to break said frangible means and enable thetool-carrier to move longitudinally with respect to the housing, andcam-means rigid with the housing lying in the path of the sample-takerfor de'ecting ythe same outwardly and into the earth at the side of thewell bore.

5. Sampling apparatus to be used in a deep well for taking a sample fromthe side of a well bore, comprising in combination, a housing, atoolrnrrier within the housing and capable of moving longitudinallywithin the same, frangible means connecting the tool-carrier and thetubular housing, Va sample-taker movably supported on the carrier andhaving its receiving mouth at its lower end. a. tool string forsupporting the tool-carrier with a jar device associated therewith, forspudding through the tool-carrier, and cam-means rigid with the housinglying in the path of the sample-taker for deflecting the same outwardlyand into the earth at the side of the well bore.

6. Sampling apparatus to be used in a deep well for taking a sample fromthe side of a well bore, comprising in combination, a housing, atoolcarrier within the housing and capable of moving longitudinallywithin the same, frangible means connecting the tool-carrier and thetubular hous ing, a sample-taker movably supportedon the carrier andhaving its receiving mouth at its lower end, a tool string forsupporting the tool-carrier with means associated therewith for enablingthe carrier to break said frangible means and enable the tool-carrier to'move longitudinally with respect to the housing, cam-means rigid withthe housing lying in the path of the sampletaker for defiecting the sameoutwardly and into the earth at the side of the well bore, and means forlocking the housing against upward movement when the tool string ispulled upwardly.

7. A sampling tool to be used in a deep well for taking a sample fromthe side of the well bore, comprising in combination a housing, ai.oolcarrier within the housing and capable of moving longitudinallywithin the same, said tool-y carrier having a longitudinal slot therein,a sampler-tool pivotally supported on the carrier in the said slot andhaving its receiving mouth at its lower end, a transverse web within thehousing received in the slot and having a cam face disposed toward thesampler-tool and lying in its path for deecting the sample-takeroutwardly to project the same into the side of the Wellbore.

8. In a sampling tool for taking a sample from the side of a well-bore,the combination of a tubular tool String having an opening in its wall,a tubular housing within the same having an opening through its sidewall, normally out of line, but capable of aligning with, the rst namedopening, a tool-carrier, a sampler-tool movably supported in the carrierand having its receiving mouth at its lower end, and lying opposite thesaid opening in the housing, said tool-string and said housing havingcorrelated means brought into action by a movement of the housingrelative to the tool string for effecting the alignment of the saidopenings, and cam-means lying in the path of the sample-taker fordeflecting the same outwardlyA through the openings when the toolcarrieris moved longitudinally in the housing.

9. In a sampling tool for taking a sample from the side of a well-bore,the combination of a tubular tool string having an opening in its wall,a tubular housing within the same having an opening through its sidewall, normally out of line, but capable of aligning with, the firstnamed opening, a tool-carrier, a sampler-tool movably supported in thecarrier and having its receiving mouth at its lower end, and lyingopposite the said opening in the housing, said tool-string and saidhousing having correlated means brought into action by a movement of thehousing relative to the tool-string for eiecting the alignment of thesaid openings, cam-means lying in the path of the sample-taker fordeecting the same outwardly through the openings when the tool-carrieris moved longitudinally in theA housing, said tool-string having abottom shoe with an opening therein, and resilient means carried by thelower end of the housing for engaging in the opening in the said bottomshoe to hold the h0using down when the tool string is pulled upwardlyafter the sample-taker has taken the sample.

10. A sampling tool to be used in a deep well for taking a sample fromthe side of the well bore,comprising in combination,a tubular housinghaving a sidey wall with an opening through the same, a tool-carrierwithin the housing having a longitudinal slot therein, a plurality ofsampletakers pivotally supported in the slot to swing in substantiallythe same plane but at diierent levels on the tool-carrier, said housinghaving a transverse web corresponding to each sample-taker and locatedbelow the same so that when the toolcarrier is moved downwardly withinthe housing, the sample-takers will be swung outwardly by the action oftheir corresponding cams so as to project them into'the side of thewell-hole, and a longitudinally extending abutment carried on the sideof the tool string substantially diametrically opposite to the side atwhich the sample-takers are projected outwardly.

11. In a deep well tool for taking samples from the side of the hole,the combination of a tubular tool string, a housing movable within thesame. a core barrel carrier associated with the housing, a sand linesupporting the carrier. a core barrel supported in the core barrelcarrier. cam means to cooperate with the core barrel upon a relativedownward movement of the carrier to pro- Ject the core barrel outwardlyfrom the housing,

and means associated with the core barrel carrier and controlled by thesand line to lock the carrier to the too1 string to enable the toolstring to exert a downward thrust on the core barrel carrier, andthereby project the core tool outwardly into the'side of the hole.

12. In a deep well tool for taking samples from the side of the hole,the combination of a tubular tool string, a housing movable within thesame, a core barrel carrier associated with the housing, a sand linesupporting the carrier, a core barrel supported in the core barrelcarrier, cam means to cooperate with the core barrel upon a relative'downward movement of the carrier to project the core barrel outwardlyfromthe housing, and a locking head associated with the core barrelcarrier and controlled by the sand line to lock the carrier to the toolstring to enable the tool string to exert a downward thrust on the corebarrel carrier, and thereby project the core tool outwardly into theside of the hole.

13.' In a deep well tool for taking samples from the side of the hole,the combination of a tubular tool string, a housing within the same, acore barrel carrier associated with the housing, a sand line, a corebarrel supported in the core barrel carrier, cam means to cooperate withthe core barrel upon a relative downward movement of the carrier toproject the core barrel outwardly from the housing, said tool stringhaving rack teeth formed thereon, constituting a rack, a lockingheadattached to the core tool carrier, pawls car'- `ried thereby tocooperate with the rack teeth, means supported by the sand line, andsupporting the too1 carrier for controlling the outward movement of thepawls into engagement with the rack teeth to lock the locking head tothe inner tool string so that a downward movement of the tool stringthereafter will enable the core barrel to cooperate with the cam meansand force the core barrel out into the formation at the side of thehole.

` 14. In a deep well tool for taking samples from the side of the hole,the combination of a tubular tool string, a housing within the same, acorebarrel carrier associated with the housing, a sand line, a corebarrel supported in the core-barrel carrier, cam means to cooperate withthe corebarrel upon a relative downward movement of the carrier toproject the core-barrel outwardly from the'housing, a locking headassociated with the core-barrel, said tool string havingv rack teethformed thereon constituting a rack, pawls mounted on the locking headprojecting upwardly at their free ends for engaging the rack teeth, asleeve supported on the sand line and guided to slide on the lockinghead for engaging the pawls to hold the same in when the driving head isrunning down the hole, and capable of moving down when the sand line isslack, to enable the pawls to lock the locking head to the tool string,so that a downward movement of the tool string thereafter will enablethe core-barrel to cooperate with the cam means and force thecore-barrel outwardly into the formation at the the core-barrel, asliding sleeve carried on the sand -line supporting the locking head andcapable of downward movement with respect to the same when the line isslack, said tool string having circumferential rack teeth formed thereonconstituting a rack, pawls mounted on the locking head for engaging therack-teeth, said sleeve having slots through which the pawls may mnveout to engage the rack teeth, resilient means to force the pawlsoutwardly to lock the locking head to the too1 string so that a downwardmovement of the too1 string thereafter will enable the corebarrel tocooperate with the cam means and torce the core-barrel outwardly intothe formation at the side of the hole, the upward movement of the sleeveoperating to release the pawls from thel rack.

16. In a sampling tool for taking a sample from the side of a well-bore,the combination of a tubular too1 string having an opening in its Wall.a tubular housing within the same having an opening through its sidewall, normally out of line, but capable of aligning with, the firstnamed opening, a tool-carrier, a sampler-tool movably supported in thecarrier and having its receiving mouth at its lower end, and lyingopposite the said opening in the housing, sid tool-string and saidhousing having correlated means brought outwardly through the 'openingswhen the toolcarrier is moved longitudinally in the housing, and meansfor anchoring the cam-means against being pulled upwardly by thetool-carrier when the same is being reciprocated in spudding thesample-takers into the side of the hole.

17. A sampling tool to be used in a deep well for taking a sample fromthe side of the well bore, comprising in combination, a tubular housinghaving a plurality of openings through its wall, a tool-carrier withinthe housing and capable of moving longitudinally within the same, aplurality of sampler tools located respectively at diflerent levels, andcorresponding to said openings, each too1 being pivotally supported onthe carrier substantially on the central axis of the carrier, each ofsaid sampler tools being suspended from above so that its receivingmouth at its lower end lies adjacent to its corresponding openingthrough the wall of the tubular housing, and cam means having aninclined face extending transversely across the space within the housingand rigid therewith, and lying in the path of cach sample taker :for`deflecting the same outwardly through its corresponding opening when thetool carrier is moved downwardly in the housing, the lower end of saidhousing being supported on the well bottom when the tool carrier movesdownwardly relative thereto, all of said parts cooperating so that thesampler tools are projected outwardly through their correspondingopenings in a general horizontal direction.

18. A sampling apparatus constructed as deiined in claim 17, in whichthere is only one sample tool supported ate'achpf the said levels, andin which each sampler tool at each level is supported on a pivot pinextending transversely to l the housing with the axis of the pivot pinsubstantially intersecting with the longitudinal axis of the too1carrier.

WALTER J. BARNHART.

